What was found
NOSE GEAR WOULDN'T LOCK UP AND RETURNED TO DEN AIRPORT. MX CLEARED ICE AND SLUSH FROM UPLOCK ASSEMBLY. AIRCRAFT DEPARTED AND NOSE GEAR FAILED TO LOCK UP AGAIN. AIRCRAFT RETURNED AND THE FLIGHT WAS CANCELLED. MX FOUND THAT THE NLG STRUT WAS NOT EXTENDING FULLY DUE TO DAMAGED SEALS INSIDE THE STRUT. THE NOSE LANDING GEAR STRUT WAS RESEALED, IAW SA227 MM CH 32-20-00, PERFORMED GEAR SWING AND NO DEFECTS NOTED.